Lol
I love the name
Lynn, and its variants - you might have seen my Linneth / Lynneth polls & posts a while back? :-)
Anyways . . . I think 'slender lake' would come closest, as the bit of "
Kayley" that meant 'slender' was the "Kayl" bit, and it seems the most likely of the meanings.
. . . there's other meanings for
Lynn? Oh, no! :-D